PDF malware analysis — malicious · b9ed745a82b09e33

MALICIOUS

PDF

69.8 KB Created: 2020-11-19 04:02:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 18419361ebf7a7b0ad494b2f2b19e75b SHA-1: 13535a8cf7733b50099f99330455332411b568a3 SHA-256: b9ed745a82b09e335b3faabb2f4bda04f20cbc4fb48252fd8ebf0fb706bbbf33

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics, including ML classification and ClamAV, as malicious. It contains a large number of external links, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, appears to contain keywords related to a guide, which is likely a lure to encourage users to click on the embedded malicious URLs.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

Heuristics 5

Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM

Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
External URI info PDF_URI

PDF contains an external URL action
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL https://trafffe.ru/123?utm_term=summoners+war+toa+guide+2017
- https://cdn-cms.f-static.net/uploads/4419826/normal_5fa024bbebede.pdf
- https://cdn-cms.f-static.net/uploads/4377391/normal_5f960e16c90a0.pdf
- https://cdn-cms.f-static.net/uploads/4376379/normal_5f89ba0d64c87.pdf
- https://cdn-cms.f-static.net/uploads/4448744/normal_5fb30668a2bfc.pdf
- https://cdn-cms.f-static.net/uploads/4375894/normal_5f8cbd243d06d.pdf
- https://cdn-cms.f-static.net/uploads/4369933/normal_5f8c0d5329c9e.pdf
- https://cdn-cms.f-static.net/uploads/4408598/normal_5fb5b40442813.pdf
- https://cdn-cms.f-static.net/uploads/4418584/normal_5f9b7374b0082.pdf
- https://rawewefugu.weebly.com/uploads/1/3/4/3/134394717/gapofofuwovo.pdf
- https://botakukejase.weebly.com/uploads/1/3/4/6/134610266/misuv.pdf
- https://cdn-cms.f-static.net/uploads/4410194/normal_5f99a16e2befc.pdf
- https://cdn-cms.f-static.net/uploads/4373519/normal_5f9a9089ad196.pdf
- https://cdn-cms.f-static.net/uploads/4384851/normal_5f9280e9dc854.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://s3.amazonaws.com/kujapomib/chest_guidelines_2016.pdf
- http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/pdf/1.3/
- http://ns.adobe.com/xap/1.0/
- http://ns.adobe.com/xap/1.0/mm/
- http://ns.adobe.com/xap/1.0/rights/
- http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d161.bin` `506919a10732d02d68d2d4ad8988273b2823b3cd548b8a4ea6a79f6b1e88cbae`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD161	5712 bytes
`font_01_sfnt_off0000e4d2.bin` `115eee5cc18915de2a77f32cc54184d5d5e08aa50e32633af6c3401280dd0430`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE4D2	11096 bytes

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